Windows Azure Storage Concepts Overview
This blog post on Windows Azure might be a bit basic for those of you who have already begun to either build an application to run on Windows Azure or to migrate an existing application to it. In any case I thought that it was excellent and worthy of drawing to your attention.
Note that it does not cover SQL Azure, another storage option that is available to you in implementing Windows Azure and hybrid could applications. For information on that Windows Azure Platform component see here, and for how they compare see this post and this one.